BS EN 61784-3:2010

FOREWORD
0 Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols,
   abbreviated terms and conventions
4 Conformance
5 Basics of safety-related fieldbus systems
6 Communication Profile Family 1 (FOUNDATION[TM])Fieldbus)
   - Profiles for functional safety
7 Communication Profile Family 2 (CIP[TM]) and Family 1
   6 (SERCOS[R]) - Profiles for functional safety
8 Communication Profile Family 3 (PROFIBUS[TM],
   PROFINET[TM]) - Profiles for functional safety
9 Communication Profile Family 6 (INTERBUS[R]) -
   Profiles for functional safety
10 Communication Profile Family 8 (CC-Link[TM]) -
   Profiles for functional safety
11 Communication Profile Family 12 (EtherCAT[TM]) -
   Profiles for functional safety
12 Communication Profile Family 13 (Ethernet
   POWERLINK[TM]) - Profiles for functional safety
13 Communication Profile Family 14 (EPA[R]) - Profiles
   for functional safety
14 Communication Profile Family 17 (RAPIEnet[TM]) -
   Profiles for functional safety
15 Communication Profile Family 18 (SafetyNET p[TM]
   Fieldbus) - Profiles for functional safety
Annex A (informative) - Example functional safety
        communication models
Annex B (normative) - Safety communication channel
        model using CRC-based error checking
Annex C (informative) - Structure of technology-specific
        parts
Annex D (informative) - Assessment guideline
Annex E (informative) - Examples of implicit vs. explicit
        FSCP safety measures
Annex F (informative) - Extended models for estimation
        of the total residual error rate rejection (RRM)
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Describes some common principles that can be used in the transmission of safety-relevant messages among participants within a distributed network which use fieldbus technology in accordance with the requirements of IEC 61508 series for functional safety.

This part of the IEC 61784-3 series explains some common principles than can be used in the transmission of safety-relevant messages among participants within a distributed network using fieldbus technology in accordance with the requirements of IEC 61508 series1 for functional safety. These principles can be used in various industrial applications such as process control, manufacturing automation and machinery.

This part² and the IEC 61784-3-x parts specify several functional safety communication profiles based on the communication profiles and protocol layers of the fieldbus technologies in IEC 61784-1, IEC 61784-2 and the IEC 61158 series.

NOTE 1 Other safety-related communication systems meeting the requirements of IEC 61508 series may exist that are not included in this standard.

NOTE 2 It does not cover electrical safety and intrinsic safety aspects. Electrical safety relates to hazards such as electrical shock. Intrinsic safety relates to hazards associated with potentially explosive atmospheres.

All systems are exposed to unauthorized access at some point of their life cycle. Additional measures need to be considered in any safety-related application to protect fieldbus systems against unauthorized access. The IEC 62443 series will address many of these issues; the relationship with the IEC 62443 series is detailed in a dedicated subclause of this part.

NOTE 3 Additional profile specific requirements for security may also be specified in IEC 61784-4³ [10].

NOTE 4 Implementation of a functional safety communication profile according to this part in a device is not sufficient to qualify it as a safety device, as defined in IEC 61508 series.

NOTE 5 The resulting SIL claim of a system depends on the implementation of the selected functional safety communication profile within this system.